[He saw that look, here - nothing escapes his eyes. For a moment, he considered badgering the man, to make him spill, but he holds off - knowing Moriarty will not answer unless he wants to. Part of being a detective is knowing when to ask.

At Moriarty's words, he involuntarily shivers - it was something he feared when he was alive, a mortal being who had no natural defenses against something pushing against his soul]

... That has been something I kept pushing down, kept pressing to keep it at bay so it would not do the same to me.